Neck muscle activity and perceived pain and discomfort due to variations of head load and posture.
D000328:Adult; D000337:Aerospace Medicine; D004576:Electromyography; D004867:Equipment Design; D006804:Ergonomics; D006257:Head; D006260:Head Protective Devices; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology; D009333:Neck / Q000473:pathology* / Q000502:physiology; D017288:Pain Threshold; D011187:Posture; D016474:Weight-Bearing